Card Reader Pre-Head Signal Conversion for Skimming Prevention
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Solution Overview
Problem
Conventional card readers are vulnerable to skimming attacks, where criminals attach signal wires to the magnetic head to steal magnetic data, and existing solutions that incorporate demodulation and encryption circuits within the magnetic head increase the size and cost of the device.
Innovation Solution
A card reader design that outputs a signal different from the magnetic data recorded on the stripe, using a pre-head with magnetic cores and coils, and incorporates a signal converting means to prevent illegal data acquisition, while minimizing the device's size and cost by eliminating the need for demodulation and encryption circuits within the magnetic head.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If demodulation and encryption circuits are stored inside the magnetic head, then skimming prevention is improved, but device size and manufacturing cost increase
Solution Approach 1:
The patent divides the card reader into functionally independent modules: the magnetic head handles only magnetic signal detection, while demodulation and encryption functions are implemented separately in the control unit. This segmentation allows each component to be optimized independently, preventing skimming at the magnetic head level while avoiding the need to embed complex circuits within the head assembly, thus resolving the contradiction between security and device size.
Solution Approach 2:
The patent introduces an intermediary signal processing architecture where the magnetic head outputs raw magnetic signals that are then processed by the control unit through demodulation and encryption. This intermediary processing layer ensures that the magnetic head itself does not need to contain complex security circuits, while still achieving skimming prevention through the combined system architecture.
2Reliability
If demodulation and encryption circuits are stored inside the magnetic head, then skimming prevention is improved, but manufacturing cost increases
Solution Approach 1:
By segmenting the system into a simple magnetic head and a control unit that handles demodulation and encryption, the patent enables standardized mass production of the magnetic head component. The complex security functions are implemented in the control unit, which can be manufactured separately and assembled, thereby reducing overall manufacturing cost while maintaining skimming prevention capabilities.
Solution Approach 2:
The patent employs a cost-effective approach by using a simple, inexpensive magnetic head that can be easily replaced, while the expensive demodulation and encryption functions are implemented in the reusable control unit. This strategy reduces the cost of the magnetic head assembly, making the overall system more manufacturable while maintaining security through the control unit's encryption capabilities.
3Device complexity
If output signal from pre-head is directly used, then signal processing is simplified, but magnetic data can be illegally acquired through attached wires
Solution Approach 1:
The patent applies preliminary anti-action by implementing encryption in the control unit before the magnetic data signal is output from the system. This pre-encryption of the signal ensures that even if wires are illegally attached to the output, the stolen data will be encrypted and unusable. This approach maintains relatively simple signal processing in the magnetic head while achieving data security through the encryption layer.
Solution Approach 2:
The control unit serves as an intermediary between the magnetic head and the external output interface. It receives raw magnetic signals, processes them through demodulation and encryption, and then outputs the processed signal. This intermediary processing ensures that the output signal cannot be directly used for skimming attacks, while keeping the magnetic head itself simple and easy to manufacture.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Effectively prevents illegal acquisition of magnetic data by outputting a distinct signal, making it difficult for criminals to extract the original data, and reduces the size and cost of the card reader by not requiring demodulation and encryption circuits within the magnetic head.
Implementation Method 1
a pre-head arranged in the vicinity of the card insertion slot for detecting the presence of the magnetic stripe, wherein the pre-head is equipped with a head portion having at least one pair of magnetic cores arranged to be opposite from each other having a magnetic gap between them and coils wound around a pair of the magnetic cores
Data Source
AI summary
The present invention is to provide a card reader that can prevent the illegal acquisition of magnetic information recorded on a magnetic stripe, based on an output signal from a pre-head. More specifically described, in a card reader having a card insertion slot for guiding a magnetic card having a magnetic stripe to a transport passage and a pre-head arranged in the vicinity of the card insertion slot for detecting the presence of the magnetic stripe, the pre-head is equipped with a head portion having at least one pair of magnetic cores arranged to be opposite from each other having a magnetic gap between them and coils wound around a pair of the magnetic cores; and a signal different from that of the magnetic information recorded on the magnetic stripe is output from the pre-head.